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Related Experiment Videos

Cytosine methylation and mammalian development

C P Walsh1, T H Bestor

  • 1Department of Genetics and Development, College of Physicians and Surgeons of Columbia University, New York, New York 10032, USA.

Genes & Development
|January 14, 1999
PubMed
Summary

Cytosine methylation does not control vertebrate development or gene expression. Instead, methylation serves specialized functions like allele-specific gene expression and silencing parasitic DNA, while development relies on conserved regulatory networks.

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Area of Science:

  • Genetics
  • Developmental Biology
  • Epigenetics

Background:

  • Programmed DNA methylation and demethylation are thought to be crucial for vertebrate development.
  • The role of methylation in regulating tissue-specific gene expression during development is not fully understood.

Purpose of the Study:

  • To investigate the correlation between DNA methylation status and gene expression in tissue-specific genes during mouse development.
  • To determine if reversible methylation regulates gene expression in a developmental context.

Main Methods:

  • Analyzing the methylation status of 5' regions of tissue-specific genes in fetal and newborn mouse tissues.
  • Examining gene expression in Dnmt1-deficient mouse embryos, where global demethylation occurs.

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Main Results:

  • No correlation was found between the methylation status of gene regulatory regions and their expression in various mouse tissues.
  • Genes previously thought to be regulated by reversible methylation were not ectopically or precociously expressed in Dnmt1-deficient embryos.
  • Demethylation in Dnmt1-deficient embryos led to biallelic expression of imprinted genes and activation of endogenous retroviruses.

Conclusions:

  • Published correlations between gene expression and methylation may reflect a consequence, not a cause, of transcriptional activation.
  • Cytosine methylation is proposed to be a specialization for large genomes, involved in allele-specific expression and silencing of parasitic elements.
  • Cellular differentiation is controlled by conserved regulatory networks independent of DNA methylation modification.